Error(s) in re-building vignettes:
--- re-building 'digestibility.Rmd' using rmarkdown
Could not fetch http://www.zotero.org/styles/springer-basic-author-date
HttpExceptionRequest Request {
  host                 = "www.zotero.org"
  port                 = 80
  secure               = False
  requestHeaders       = []
  path                 = "/styles/springer-basic-author-date"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
  proxySecureMode      = ProxySecureWithConnect
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'digestibility.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'digestibility.Rmd'

--- re-building 'feedconv.Rmd' using rmarkdown
Could not fetch http://www.zotero.org/styles/springer-basic-author-date
HttpExceptionRequest Request {
  host                 = "www.zotero.org"
  port                 = 80
  secure               = False
  requestHeaders       = []
  path                 = "/styles/springer-basic-author-date"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
  proxySecureMode      = ProxySecureWithConnect
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'feedconv.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'feedconv.Rmd'

--- re-building 'growth.Rmd' using rmarkdown
Could not fetch http://www.zotero.org/styles/springer-basic-author-date
HttpExceptionRequest Request {
  host                 = "www.zotero.org"
  port                 = 80
  secure               = False
  requestHeaders       = []
  path                 = "/styles/springer-basic-author-date"
  queryString          = ""
  method               = "GET"
  proxy                = Nothing
  rawBody              = False
  redirectCount        = 10
  responseTimeout      = ResponseTimeoutDefault
  requestVersion       = HTTP/1.1
  proxySecureMode      = ProxySecureWithConnect
}
 (ConnectionFailure user error (Network.Socket.gai_strerror not supported: 11002))
Error: processing vignette 'growth.Rmd' failed with diagnostics:
pandoc document conversion failed with error 61
--- failed re-building 'growth.Rmd'

SUMMARY: processing the following files failed:
  'digestibility.Rmd' 'feedconv.Rmd' 'growth.Rmd'

Error: Vignette re-building failed.
Execution halted